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Russia asked the FBI to investigate the Boston bombing suspect Tamerlan Tsarnaev in 2011, a US law enforcement official has told Reuters.

The FBI said yesterday that its interview of Tsarnaev, following a tip from a foreign government two years ago, and checks of travel records, Internet activity and personal associations, "did not find any terrorism activity" at that time.

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The militant group responsible for the Chechen insurgency denied it has any link to the Boston Marathon bombings and claimed the investigation is part of an anti-Chechnya “PR campaign”, NBC News reported.

The Chechen mujahideen's media operation, the Kavkaz Centre, published a blog post in which it mocked the "lightning speed" that suspects Dzhokhar and Tamerlan Tsarnaev were identified, according to a translation.

It questions the logic that the Tsarnaev brothers could be terrorists, saying, "The news that the brothers attacked police officers, carjacked a man and did an array of other things, instead of going into hiding, looks strange at the very least”.

The Kavkaz Centre also suggests that Dzhokhar Tsarnaev - who remains on the run - was “very far from your typical ‘Islamic terrorist’".

"What's more, he just logged onto his Russian social networking site a few hours ago”, it added.

Anzor Tsarnaev claims he is the father of the Boston Marathon bombing suspects. Credit: REUTERS/Reuters TV

A man who claims to be the Boston bombing suspects' father has alleged the pair were framed and urged police officers not to kill Dzhokhar Tsarnaev, who is still at large, Reuters reported.

Speaking in Makhachkala, the capital of Dagestan, Anzor Tsarnaev reportedly said, "Somebody clearly framed them. I don't know who exactly framed them, but they did. They framed them. And they were so cowardly that they shot the boy dead".

"I can't reach anyone [on the phone]. I want to know about my children. I'm scared for my boy - that they will shoot him dead too somewhere. And then they'll just say, 'He had weapons'. Where can kids get weapons for God's sake?", he added.